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H A DMakefilediff 315da87c Wed Feb 03 00:52:39 MST 2021 Masahiro Yamada <masahiroy@kernel.org> kbuild: fix duplicated flags in DEBUG_CFLAGS

Sedat Dilek noticed duplicated flags in DEBUG_CFLAGS when building
deb-pkg with CONFIG_DEBUG_INFO. For example, 'make CC=clang bindeb-pkg'
reproduces the issue.

Kbuild recurses to the top Makefile for some targets such as package
builds.

With commit 121c5d08d53c ("kbuild: Only add -fno-var-tracking-assignments
for old GCC versions") applied, DEBUG_CFLAGS is now reset only when
CONFIG_CC_IS_GCC=y.

Fix it to reset DEBUG_CFLAGS all the time.

Fixes: 121c5d08d53c ("kbuild: Only add -fno-var-tracking-assignments for old GCC versions")
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Mark Wielaard <mark@klomp.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
diff 315da87c Wed Feb 03 00:52:39 MST 2021 Masahiro Yamada <masahiroy@kernel.org> kbuild: fix duplicated flags in DEBUG_CFLAGS

Sedat Dilek noticed duplicated flags in DEBUG_CFLAGS when building
deb-pkg with CONFIG_DEBUG_INFO. For example, 'make CC=clang bindeb-pkg'
reproduces the issue.

Kbuild recurses to the top Makefile for some targets such as package
builds.

With commit 121c5d08d53c ("kbuild: Only add -fno-var-tracking-assignments
for old GCC versions") applied, DEBUG_CFLAGS is now reset only when
CONFIG_CC_IS_GCC=y.

Fix it to reset DEBUG_CFLAGS all the time.

Fixes: 121c5d08d53c ("kbuild: Only add -fno-var-tracking-assignments for old GCC versions")
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Mark Wielaard <mark@klomp.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
diff 121c5d08 Sat Oct 17 06:01:35 MDT 2020 Mark Wielaard <mark@klomp.org> kbuild: Only add -fno-var-tracking-assignments for old GCC versions

Some old GCC versions between 4.5.0 and 4.9.1 might miscompile code
with -fvar-tracking-assingments (which is enabled by default with -g -O2).
Commit 2062afb4f804 ("Fix gcc-4.9.0 miscompilation of load_balance()
in scheduler") added -fno-var-tracking-assignments unconditionally to
work around this. But newer versions of GCC no longer have this bug, so
only add it for versions of GCC before 5.0. This allows various tools
such as a perf probe or gdb debuggers or systemtap to resolve variable
locations using dwarf locations in more code.

Signed-off-by: Mark Wielaard <mark@klomp.org>
Acked-by: Ian Rogers <irogers@google.com>
Reviewed-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff 121c2a13 Sun May 10 09:50:13 MDT 2020 Masahiro Yamada <masahiroy@kernel.org> kbuild: error out if targets prefixed with '__' are directly run

Some targets are internal-use only.

It is tedious to care about "what if __build_one_by_one is contained
in $(MAKECMDGOALS)?" etc.

Prefix internal targets with double underscores. Stop parsing Makefile
if they are directly run.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff 121c2a13 Sun May 10 09:50:13 MDT 2020 Masahiro Yamada <masahiroy@kernel.org> kbuild: error out if targets prefixed with '__' are directly run

Some targets are internal-use only.

It is tedious to care about "what if __build_one_by_one is contained
in $(MAKECMDGOALS)?" etc.

Prefix internal targets with double underscores. Stop parsing Makefile
if they are directly run.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

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